Measures for identification and prevention of downy mildew disease in pumpkin category crops

19/06/2022Posted on

Introduction of the disease –  downy mildew is a serious problem of Cucurbit Crops like watermelon, melon, cucumber, pumpkin, Ridge gourd etc. Which is caused by a fungus called Pseudoperonospora cubensis. Once infested, the disease spreads rapidly, adversely affecting fruit quality and production.

Symptoms of the disease – Symptoms of the disease first appear as small yellow spots or water-soaked lesions on older leaves. A white downy mildew coating appears on the lower surface of the leaf. Due to the high humidity in the environment for a long time, the spread of the disease is rapid.

Disease control – Biological control – Spraying of Pseudomonas fluorescens @ 500 gm per acre can be done.

Chemical control – Spray Azoxystrobin 11% + Tebuconazole 18.3% SC @ 300 ml or Metalaxyl 8% + Mancozeb 64% @ 500 g/acre.

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Powdery mildew and downy mildew symptoms and management

08/07/2020Posted on
Powdery mildew and downy mildew symptoms and management
  • Both usually affect only the leaves, which attack the lower and upper parts of the leaves.
  • Downy mildew (Plasmopara viticola) affects many plants and appears as yellow to white patches on the lower surfaces of older leaves. On the undersides, this area appears white to brown in color.
  • Powdery mildew also affects many plants and appears as yellow to white spots on the upper surfaces of old leaves.
  • For the management of these, azoxystrobin is sprayed at the rate of 11% + tebuconazole 18.3% SC @ 300 ml / acre or azestrobin @ 300 ml / acre or tebuconazole 10% + sulfur 65% WG @ 500 gram / acre.
  • Spraying Trichoderma viridis @ 250gram / acre + Pseudomonas fluorescens @ 250gram / acre as a biological treatment
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Management of Downy Mildew in watermelon crop 

05/03/2020Posted on
  • Plucking and destroying affected leaves helps in reducing Downy Mildew in watermelon crop.
  • Plant seeds of disease-resistant varieties.
  • Crop rotation and sanitation reduces the severity of the disease.
  • Drench with thiophenate methyl 70% WP at the rate of 300 gm/acre.
  • Spray Metalaxyl 8%+Mancozeb 64% WP at the rate of  500 gm/acre.
  • Spray pseudomonas fluorescens @ 500 gram/acre.
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How to identify Downy Mildew in watermelon crop 

05/03/2020Posted on
  • Water-soaked lesions appear under the surface of leaf lamina.
  • Angular spots appear on the upper surface similar to water-soaked lesions.
  • Lesions appear first on the older leaves and progressive on the younger leaves.
  • As the lesions expand, they may remain yellow or become dry and brown.
  • Affected vines do not bear fruits properly.
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How to identify downy mildew in pumpkin crop?

25/02/2020Posted on

The major symptoms of downy mildew in pumpkin crop are as follows-

  • Water-soaked lesions are formed on the lower surface of the leaves.
  • Lesions appear first on the older leaves and then progress on the younger leaves.
  • As the lesions expand, they may remain yellow or become dry and brown.
  • Affected vines do not bear fruit properly. 
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Management of Downy Mildew in Onions

23/10/2019Posted on

Management of Downy Mildew in Onions:-

Symptoms:-

  • Violet colour fungus on the surface of leaves or flower stalk, which later becomes pale greenish yellow colour.
  • Finally, the leaves or seed stalks collapses.
  • The disease is worst in damp condition, late planting and application of higher doses of fertilizer and numerous irrigation.

Control

  • Onion bulb used for seed crop should be exposed to sunlight for 12 days to destroy the fungus.
  • Spray with Mancozeb + Metalxyl or Carbendazim + Mancozeb @ 400 Gm/Acre at fort night interval.

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How to Control Downy Mildew in Cauliflower

07/10/2019Posted on
  • Proper water management so that there is no excess moisture on the soil surface.
  • Saaf (Carbendazim 12% + Mancozeb 63% WP) @ 300-400 gm/acre or
  • Ridomil gold (Metalaxyl 4%+ Mancozeb 64% WP) @ 300-400 gm/acre.
  • Amistar (Azoxystrobin 23%Sc) @ 200 ml/acre.
  • Netivo (Tebuconazole50%+Trifloxystrobin 25%WG) can be sprayed @120 gm/acre.
  • Follow the crop cycle and keep the field clean.

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How to Control Downy Mildew in Cauliflower

24/08/2019Posted on
  • Proper water management so that there is no excess moisture on the soil surface.
  • Saaf (Carbendazim 12% + Mancozeb 63% WP) @ 300-400 gm/acre or
  • Ridomil gold (Metalaxyl 4%+ Mancozeb 64% WP) @ 300-400 gm/acre.
  • Amistar (Azoxystrobin 23%Sc) @ 200 ml/acre.
  • Netivo (Tebuconazole50%+Trifloxystrobin 25%WG) can be sprayed @120 gm/acre.
  • Follow the crop cycle and keep the field clean.

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What’re the Symptoms of Downy Mildew in Cauliflower

24/08/2019Posted on
  • The stem shows dark brown, depressed lesions which later develop downy growth of the fungus.
  • On leaves, purplish-brown spots appear on the under surface followed by the appearance of downy growth on such lesions.
  • It causes damage to curd, producing curd-rot.

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